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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        //circle.js文件
        export function area(radius){
            return Math.PI*radius*radius;
        }
        export function circumference(radius){
            return 2*Math.PI*radius;
        }
        

        //必须加type="module"
        //需同源
        //部分加载

        import {area,circumference} from './circle.js';

        console.log('圆面积: '+area(4));
        console.log('圆周长: '+circumference(14));

        //整体加载
        import * as circle from './circle.js';

         console.log('圆面积: '+circle.area(4));
        consoel.log('圆周长: '+circle.circumference(14));
    </script>
</body>
</html>